Jar and safety coupling,申请号US19330666290-传众专利搜索

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发明名称	Jar and safety coupling
摘要
申请公布号	US1989907(A)	申请公布日期	1935.02.05
申请号	US19330666290	申请日期	1933.04.15
申请人	JAMES A. KAMMERDINER	发明人	BECK JULIUS S.
分类号	E21B17/06;E21B31/107	主分类号	E21B17/06
代理机构		代理人
主权项
地址

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